Process and device for reeling a paper web

ABSTRACT

The invention relates to a process for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break. According to the invention, this is achieved by pressing the paper web tail ( 8 ′) or the entire width of the web onto the reel drum ( 5 ) and securing it there by means of an auxiliary roll ( 9 ) before it is transferred to the reel spool ( 3 ). The invention also relates to a device for reeling a paper web, particularly a tissue web, specifically when starting up the machine and after a web break, using a reel spool ( 3 ) and a reel drum ( 5 ). An auxiliary roll ( 9 ) is provided in addition to press a paper web tail ( 8 ′) or the entire web width onto the reel drum ( 5 ) and secure it there.

BACKGROUND OF THE INVENTION

The invention relates to a process for reeling a paper web, particularlya tissue web, specifically when starting up the machine and after a webbreak. In addition, the invention relates to a device for reeling apaper web, particularly a tissue web, specifically when starting up themachine and after a web break, using a reel spool and a reel drum.

Processes and devices are known in which the tail feed strip is reeledonto a reel spool or a winding tube, on or to which an adhesive or anadhesive strip has been applied manually over the entire web width. Anautomatic adhesive application device is known from U.S. Pat. No.6,253,818. The adhesive can also be applied to the paper web ahead ofthe reel spool using spray nozzles. In these known processes, only atail strip is wound onto the reel first of all, thus causing unevennesswhen the paper web then becomes broader to extend over the machinewidth. In addition, air entrapment may occur, which can cause the web torun off track. Due to the unevenness over the web width, particularlythe equipment for measuring the web tension and corresponding controldevice (winding tightness control) can no longer be used.

SUMMARY OF THE INVENTION

The aim of the invention is thus to transfer the full web width onto thereel spool or winding tube when feeding in the web or after a web break.This method can also reduce the amount of broke.

According to the invention, this is achieved by pressing the paper webtail or the entire width of the web onto the reel drum and securing itthere by means of an auxiliary roll before it is transferred to the reelspool. In this way, the web tail or the entire web width can run overthe reel drum without the disadvantages of having to be wound onto thereel spool.

In one aspect, the invention is directed to a process for reeling apaper web having a main portion of nominal web width and a front portionof any width up to the nominal width, onto a reel spool rotating at amachine speed adjacent to a rotating reel drum. The steps includefeeding the front onto the reel drum while the reel spool is spaced fromthe reel drum and pressing and holding the front portion against thereel drum whereby the front portion follows the rotation of and thenseparates from the reel drum. While the front portion is pressed andheld against the reel drum, the reel spool is brought up to machinespeed and substantially simultaneously, the reel spool is pressedagainst the web on the reel drum and the web front portion of the web issevered, thereby exposing a leading edge of the web main portion. Theexposed edge is directed to the reel spool and the web main portion iswound around the reel spool at machine speed.

The front portion can be a tail having a free end and a width thatincreases from less than half the nominal width at the free end to thenominal width at the main portion. Alternatively, the front portion is acontinuation of at the same width as the main portion.

An advantageous further development of the invention is characterized bythe auxiliary roll being at a standstill, however it can also beoperated in creep mode or accelerated to and then operated at productionspeed. Thus, the paper web tail can be placed easily over the reel drumwhen first fed in after a shutdown and can also be inserted againquickly after a web break.

A favorable embodiment of the invention is characterized by the paperweb tail being diverted into a pulper after the reel drum until the webhas the required width. This provides a favorable means of transferringthe web in its the entire width.

A particularly favorable further development of the invention ischaracterized by an adhesive being applied to the reel spool so that thefull width of the web can be transferred instantly to the reel spool.With this step, the entire web can be wound directly onto the reel spoolwithout unevenness occurring at the edges.

The invention also relates to a device for reeling a paper web,particularly a tissue web, specifically when starting up the machine andafter a web break, using a reel spool and a reel drum. According to theinvention, this device is characterized by an auxiliary roll beingprovided in addition to press a paper web tail or the entire web widthonto the reel drum and secure it there.

If the auxiliary roll has a design that is suitable for pressing ontothe reel drum, the paper web can be secured to the reel drumparticularly well. If the auxiliary roll can be lifted off the reeldrum, this will prevent anything from influencing normal productionoperations. If the auxiliary roll has a drive to accelerate toproduction speed, transfer of the paper web tail or the entire web widthcan be performed particularly favorably until the web is received on thereel spool.

If a device is provided for applying adhesive to the reel spool, theentire web width can be transferred particularly well to the reel spoolwithout any unevenness over the web width. This results in a sharp dropin the amount of broke.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in examples and referring to thedrawings, where

FIG. 1 shows a state-of-the-art reeling device;

FIG. 2 contains a schematic diagram of the invention feeding in the webtail;

FIG. 3 is a schematic diagram of the invention with the web beingtransferred to the reel spool; and

FIG. 4 is a schematic diagram of the invention in continuous windingoperation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows the arrangement of a reeling device 1 for a paper machine,particularly a tissue machine, where the paper is wound onto a reel 2.The empty reel spool 3 has a rubber covering or is fitted with a coreshaft 3′ and brought from a storage area into position 3″ to a reel drum5 using a lever 4. From there, the reel spool 3 is swung in direction 6towards the full reel, where the paper is cut over the entire width incontinuous operation, and reeling continues immediately onto the emptyreel spool 3. This embodiment has an adhesive applying device 7 mountedabove the storage position for the empty reel 3 to apply adhesive to theempty core shaft 3′.

FIG. 2 shows the invention with a front portion 8′ such as a web tailbeing fed to a reel drum 5. A web guiding device is used to feed thepaper web tail into the space between the reel drum 5 and the auxiliaryroll 9, where the auxiliary roll 9 is either at a standstill, or runningat creep or any other desired speed. Subsequently, the auxiliary roll 9is pressed onto the reel drum 5 and thus secures the web tail 8. Afterleaving the reel drum 5, the web tail 8 is diverted into a pulper (notshown). This is where web widening begins, i.e. the web tail broadensuntil it reaches the full web width. Then it can be cut lengthwise inone or more places using a slitter. At the same time, an empty reelspool 3 (position 3 a) from the reel spool magazine is brought to thereel spool lift (lever 4) and adhesive 10 is applied to the reel spool 3(in position 3 b) using an adhesive applying device 7. As analternative, an adhesive strip can also be applied over the entire webwidth. The reel spool is then placed in the primary arm of the winder 1using the reel spool lift.

FIG. 3 illustrates the status when the entire (main) web portion 8 istransferred to the reel spool 3. The reel spool 3 is brought to machinespeed in position 3 c and then pressed onto the paper web 8 running overthe reel drum 5 in position 3 d. At the same time, the entire web isdetached instantly, i.e. within a fraction of a second, and woundimmediately onto the reel spool 3. It can be appreciated from FIG. 3 thereel drum 5 has a rotation axis and four quadrants centered on the axis,and that preferably, the auxiliary roll 9 and the reel spool 3 aresituated at respective adjacent quadrants, with the auxiliary rollupstream of the reel spool. Since the paper web widens on the reel drum5 from the web tail to the full web width during the start-up procedure,and also after a web break should the situation arise, the web can alsobe transferred to the reel spool right away with its full width and neednot be allowed to widen during winding on the reel spool, as was thecase to date, which would lead to the unevenness and problems describedabove.

FIG. 4 shows the situation during continuous winding of the paper web 8onto the reel 2, where the auxiliary roll 9 is lifted off the reel drum5 here and thus, there are no obstacles for the paper web.

The invention is not limited to the variants shown. It can be used inany paper machine, but does bring advantages in tissue machines becauseit is particularly important here to have even web distribution over theweb width and because, due to creping, there is also a particular riskof air entrapment between the layers of the paper web on the core shaft,which could thus cause web displacement. There are various possibilitiesfor transferring the web to the reel spool, where the embodiment withadhesive and instant transfer of the entire paper web is particularlyadvantageous.

1. Process for reeling a paper web having a main portion of nominal webwidth and a front portion of any width up to said nominal width, onto areel spool rotating at a machine speed adjacent to a rotating reel drum,comprising: feeding the front portion onto the reel drum while the reelspool is spaced from the reel drum; pressing and holding the frontportion against the reel drum whereby the front portion follows therotation of and then separates from the reel drum; while the frontportion is pressed and held against the reel drum, bringing the reelspool up to machine speed; substantially simultaneously, pressing thereel spool against the web on the reel drum and severing the web frontportion, thereby exposing a leading edge of the web main portion; anddirecting the exposed edge to the reel spool and winding the web mainportion around the reel spool at machine speed.
 2. Process according toclaim 1, wherein the front portion is a tail having a free end and awidth that increases from less than half said nominal width at the freeend to said nominal width at the main portion.
 3. Process according toclaim 1, wherein the front portion is a continuation of, at the samewidth as, the main portion.
 4. Process according to claim 1, wherein thefront portion of the web upon separation from the reel drum, is directedto a pulper.
 5. Process according to claim 1, wherein an auxiliary rollpresses and holds the front portion of the web against the reel drum. 6.Process according to claim 1, wherein while the main portion is windingaround the spool at machine speed, the auxiliary roll is retracted fromthe reel drum.
 7. Process according to claim 1, wherein the auxiliaryroll is at a standstill.
 8. Process according to claim 1, wherein theauxiliary roll is operated in creep mode.
 9. Process according to claim1, wherein the auxiliary roll is accelerated to and then maintained at atarget speed.
 10. Process according to one of claim 2, wherein the paperweb tail is diverted into a pulper after the reel drum until saidseparation.
 11. Process according to claim 1, including applying anadhesive to the reel spool.
 12. Process according to claim 1, whereinthe full width of the web is transferred instantly to the reel spool.13. Device for reeling a paper web onto a reel spool located downstreamof and cooperating with a rotating reel drum, wherein the improvementcomprises an auxiliary roll upstream of the reel spool for pressing andholding the web against the reel drum.
 14. Device according to claim 13,whereby the auxiliary roll is movable between an active position againstthe reel drum and a retracted position spaced from the reel drum. 15.Device according to claim 13, wherein the reel drum has a rotation axisand four quadrants centered on said axis, and the auxiliary roll andreel spool are situated at respective adjacent quadrants.
 16. Deviceaccording to claim 13, wherein the auxiliary roll is rotatably drivableat a selected variable speed.
 17. Device according to claim 13,including an adhesive application for the reel spool.